Leaky Bottles

I bought the bottles below recently. I’ve noticed it’s common for them to have a light film of juice on them if they ever tip over for a bit. If I put a few in a bag to bring to somebody, they are slimy by the time I take them out of the bag. I always tighten them as much as possible. Is this just cheap non child proof caps, or are all non child proof caps the same? I like non child proof, but I’m hesitant to get any more. I’ve never noticed this on any other bottles I’ve owned.

Also, anybody know of a site to buy glass bottles but with free or cheap shipping? I’m finding all kinds of cheap bottles, but shipping ruins any decent pricing.